Anthraquinone vat dyes and process of making them.



UNITED STATES PATENT OFFICE.

MAX xsnnn, or MANNHEIM, ennmmnassrenon T BAIDISOHE amnm a SODA FABRIK, or mmwxesnnrnn-on-rnn-Rama, GERMANY, -.A CORPORATION.

ANTHRAQUINONE VAT DYES AND PROCESS OF MAKING THEM.

No Drawing.

Specification of Letters Patent.

Application filed March 30, 1912. Serial No. 687,512.

Patented J uly9, 1912.

To all whom it may concern Be it known that I, MAX IsLER, citizen of .the Swiss Republic, residing at Mannheim,

Germany, have invented new and useful Improvements in Anthraquinone Vat Dyes and Processes of Making Them, of which the following is a speci cat-ion.

My invention relates to new vat dyes of the anthraquinone series which are regarded as containing two anthraquinone residues joined together by means of one nitrogen atom and one sulfur atom. The simplest member of the group probably possesses a constitution corresponding to the formula I can produce my new dyes by reacting on l-halogen-anthraquinone or on a derivative thereof, as hereinafter defined, with an anthraquinone compound which contains in also be obtained by actingwith a 1-mercap-- to-anthraquinone on an ortho-halogen-amino-anthraquinone.

My new dyes are characterized by being obtainable in the form of violet-blue crystals and they yield green solutions in concentrated sulfuric acid, from yellow to brown vats with alkaline hydrosulfite, and dye cotton from violetto blue shades of excellent fastness.

The following examples will serve to.

illustrate further the nature of my invention and how it can be carried into practical effect, but the invention is not confined to these examples. The parts are by weight.

Example 1: Boil together 20 parts of the potassium salt of 2-.amino-anthraqu1none-1- mercaptan, 15 parts of 1.2-d1chlor-anthraquinone and from '200 to400 parts of nitro- 'soda solution, but yields a green solution in concentrated sulfuric acid. With alkaline hydrosulfite it forms a yellow-brown vat which dyes cotton fast violet-blue shades.

In a similar manner, derivatives of Q-aminoanthraquinone l-mercaptan, or of 1.2-dichlor-anthraquinone can be converted int coloring matters.

Example 2: Boil together 30 parts of the sodium salt of Q-amino-arithraquinone-lmercaptan, 25 parts of l-chlor-anthraquinone and from 300 to 600 parts of nitrobenzene. When the formation of the coloring matter is complete, filter-wit off and re move any adhering nitrobenzene, whereupon the coloring matter is obtained in a .pure state. In this example, pyridin or naphthalene may be employed instead of nitrobenzene. A similar procedure can be employed in order to produce coloring matters from 1-chlor-anthraquinone-Q-carboxylic acid, or from 1 chlor 2 amino anthraquinone, or from 1-chlor-anthraquinone-2-aldehyde, or from 1 chlor 2 methoxy-3-met-hyl-anthraquinone, instead of from l-chlor-anthraquinone.

Example 3: Boil together 20 parts of 1- chlor-2-amino-anthraquinone and 20 parts of the sodium salt of anthraquinone-l-mercaptan and 200 to 400 parts of nitrobenzene (preferably with the addition of from 10 to 20 parts of potassium carbonate) until the formation 0 the colorin matter is complete, and then isolate it inthe usual manner. It dyes cotton, from the vat, violetblue shades. In this example, the -1-chlor-2- amino-anthraquinone can be replaced by other ortho-halogen-amino-anthraquinones v for instance the coloring matter prepared from 1.3 dibrom 2 amino anthraqumone dyes cotton, from a vat, violet-blue shades.

Now what I claim is 1. The process of producing vat dyes of the anthraquinone series by reacting on a l-halogen-anthraqninone.body with an an tained inthe form of violet-blue crystals thraquinone compound which contains in the positions 1 and 2'one mercapto group and one amino group. a

2. The process of producing vat dyes of the anthraquinone series by reacting on anthraquinone-l-mercaptan with an orthohalogen-amino anthraquinone.

, 3. The vprocess of producing a vet dye of the anthraquinone series by reacting on 2- amino-anthraquinone l-mercaptan with 1- chlor-anthraquinone.

4. The new vat dyes of the anthraquinone "series which can be obtained by reacting on a. l-halogen-anthraquinone body with an anthraquinone compound which contains in the positions 1 and 2 one mercapto group and one amino oup, which new compounds probably contain two anthraquinone residues joined together by one nitrogen atom and one sulfur atom and which can be obwhich yield green solutions in concentrated sulfuric acid, which give from yellow to brown vats with alka in e hydrosulfite and dye cotton from violet to blue shades of excellent fastness.

5. The new vat'dyewhich can be obtained by condensing 2 -aminoanthraquinone- 1 merca tan with l-chlor-anthraquinone and proba ly possesses a constitution correspondingto the formulawitnesses.

MAX ISLER.

Witnesses:

J. ALEG. LLOYD, Jos. PEIFFER. 

